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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"test_capi.test_watchers fails with \"env changed\" on \"wasm32-emscripten node\": Warning -- Unraisable exception","articleBody":"# Bug report\n\n### Checklist\n\n- [X] I am confident this is a bug in CPython, not a bug in a third-party project\n- [X] I have searched the [CPython issue tracker](https://github.com/python/cpython/issues?q=is%3Aissue+sort%3Acreated-desc),\nand am confident this bug has not been reported before\n\n\n### CPython versions tested on:\n\nCPython main branch\n\n### Operating systems tested on:\n\nOther\n\n### Output from running 'python -VV' on the command line:\n\n_No response_\n\n### A clear and concise description of the bug:\n\nRecent build: https://buildbot.python.org/all/#/builders/1050/builds/2826\n\nDictionary watcher tests using ``catch_unraisable_exception`` context manager fails on the \"wasm32-emscripten node (pthreads) 3.x\" buildbot: the exception was logged too late, after ``catch_unraisable_exception`` block.\n\nExample of error:\n\n```\ntest_dealloc_watcher_raises_error (test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error) ... Warning -- Unraisable exception\nException ignored in: 'PyFunction_EVENT_DESTROY watcher callback for \u003cfunction loop at 0x19e62a0\u003e'\nTraceback (most recent call last):\n  File \"/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py\", line 532, in watcher\n    raise MyError(\"testing 123\")\ntest.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.\u003clocals\u003e.MyError: testing 123\n```\n\nFull logs:\n\n\u003cdetails\u003e\n\n```\ntest_dealloc_watcher_raises_error (test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error) ... Warning -- Unraisable exception\nException ignored in: 'PyFunction_EVENT_DESTROY watcher callback for \u003cfunction loop at 0x19e62a0\u003e'\nTraceback (most recent call last):\n  File \"/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py\", line 532, in watcher\n    raise MyError(\"testing 123\")\ntest.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.\u003clocals\u003e.MyError: testing 123\nWarning -- Unraisable exception\nException ignored in: 'PyFunction_EVENT_DESTROY watcher callback for \u003cfunction nop at 0x17c5218\u003e'\nTraceback (most recent call last):\n  File \"/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py\", line 532, in watcher\n    raise MyError(\"testing 123\")\ntest.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.\u003clocals\u003e.MyError: testing 123\nWarning -- Unraisable exception\nException ignored in: 'PyFunction_EVENT_DESTROY watcher callback for \u003cfunction long_loop at 0x1628518\u003e'\nTraceback (most recent call last):\n  File \"/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py\", line 532, in watcher\n    raise MyError(\"testing 123\")\ntest.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.\u003clocals\u003e.MyError: testing 123\nWarning -- Unraisable exception\nException ignored in: 'PyFunction_EVENT_DESTROY watcher callback for \u003cfunction  at 0x19edb78\u003e'\nTraceback (most recent call last):\n  File \"/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py\", line 532, in watcher\n    raise MyError(\"testing 123\")\ntest.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.\u003clocals\u003e.MyError: testing 123\nWarning -- Unraisable exception\nException ignored in: 'PyFunction_EVENT_DESTROY watcher callback for \u003cfunction TestPendingCalls.PendingTask.run_in_pending_call.\u003clocals\u003e.callback at 0x16431a0\u003e'\nTraceback (most recent call last):\n  File \"/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py\", line 532, in watcher\n    raise MyError(\"testing 123\")\ntest.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.\u003clocals\u003e.MyError: testing 123\nWarning -- Unraisable exception\nException ignored in: 'PyFunction_EVENT_DESTROY watcher callback for \u003cfunction TestPendingCalls.PendingTask.run_in_pending_call.\u003clocals\u003e.callback at 0x19d4b50\u003e'\nTraceback (most recent call last):\n  File \"/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py\", line 532, in watcher\n    raise MyError(\"testing 123\")\ntest.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.\u003clocals\u003e.MyError: testing 123\nWarning -- Unraisable exception\nException ignored in: 'PyFunction_EVENT_DESTROY watcher callback for \u003cfunction TestPendingCalls.PendingTask.run_in_pending_call.\u003clocals\u003e.callback at 0x17944b8\u003e'\nTraceback (most recent call last):\n  File \"/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py\", line 532, in watcher\n    raise MyError(\"testing 123\")\ntest.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.\u003clocals\u003e.MyError: testing 123\nWarning -- Unraisable exception\nException ignored in: 'PyFunction_EVENT_DESTROY watcher callback for \u003cfunction TestPendingCalls.PendingTask.run_in_pending_call.\u003clocals\u003e.callback at 0x1860cf8\u003e'\nTraceback (most recent call last):\n  File \"/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py\", line 532, in watcher\n    raise MyError(\"testing 123\")\ntest.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.\u003clocals\u003e.MyError: testing 123\nWarning -- Unraisable exception\nException ignored in: 'PyFunction_EVENT_DESTROY watcher callback for \u003cfunction TestPendingCalls.PendingTask.run_in_pending_call.\u003clocals\u003e.callback at 0x1860c80\u003e'\nTraceback (most recent call last):\n  File \"/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py\", line 532, in watcher\n    raise MyError(\"testing 123\")\ntest.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.\u003clocals\u003e.MyError: testing 123\nWarning -- Unraisable exception\nException ignored in: 'PyFunction_EVENT_DESTROY watcher callback for \u003cfunction TestPendingCalls.PendingTask.run_in_pending_call.\u003clocals\u003e.callback at 0x185fec8\u003e'\nTraceback (most recent call last):\n  File \"/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py\", line 532, in watcher\n    raise MyError(\"testing 123\")\ntest.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.\u003clocals\u003e.MyError: testing 123\nWarning -- Unraisable exception\nException ignored in: 'PyFunction_EVENT_DESTROY watcher callback for \u003cfunction TestPendingCalls.PendingTask.run_in_pending_call.\u003clocals\u003e.callback at 0x18960c0\u003e'\nTraceback (most recent call last):\n  File \"/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py\", line 532, in watcher\n    raise MyError(\"testing 123\")\ntest.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.\u003clocals\u003e.MyError: testing 123\nWarning -- Unraisable exception\nException ignored in: 'PyFunction_EVENT_DESTROY watcher callback for \u003cfunction TestPendingCalls.PendingTask.run_in_pending_call.\u003clocals\u003e.callback at 0x194f980\u003e'\nTraceback (most recent call last):\n  File \"/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py\", line 532, in watcher\n    raise MyError(\"testing 123\")\ntest.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.\u003clocals\u003e.MyError: testing 123\nWarning -- Unraisable exception\nException ignored in: 'PyFunction_EVENT_DESTROY watcher callback for \u003cfunction TestPendingCalls.PendingTask.run_in_pending_call.\u003clocals\u003e.callback at 0x18ee1b8\u003e'\nTraceback (most recent call last):\n  File \"/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py\", line 532, in watcher\n    raise MyError(\"testing 123\")\ntest.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.\u003clocals\u003e.MyError: testing 123\nWarning -- Unraisable exception\nException ignored in: 'PyFunction_EVENT_DESTROY watcher callback for \u003cfunction TestPendingCalls.PendingTask.run_in_pending_call.\u003clocals\u003e.callback at 0x19240b8\u003e'\nTraceback (most recent call last):\n  File \"/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py\", line 532, in watcher\n    raise MyError(\"testing 123\")\ntest.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.\u003clocals\u003e.MyError: testing 123\nWarning -- Unraisable exception\nException ignored in: 'PyFunction_EVENT_DESTROY watcher callback for \u003cfunction TestPendingCalls.PendingTask.run_in_pending_call.\u003clocals\u003e.callback at 0x168ff60\u003e'\nTraceback (most recent call last):\n  File \"/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py\", line 532, in watcher\n    raise MyError(\"testing 123\")\ntest.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.\u003clocals\u003e.MyError: testing 123\nWarning -- Unraisable exception\nException ignored in: 'PyFunction_EVENT_DESTROY watcher callback for \u003cfunction TestPendingCalls.PendingTask.run_in_pending_call.\u003clocals\u003e.callback at 0x16c3df0\u003e'\nTraceback (most recent call last):\n  File \"/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py\", line 532, in watcher\n    raise MyError(\"testing 123\")\ntest.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.\u003clocals\u003e.MyError: testing 123\nWarning -- Unraisable exception\nException ignored in: 'PyFunction_EVENT_DESTROY watcher callback for \u003cfunction TestPendingCalls.PendingTask.run_in_pending_call.\u003clocals\u003e.callback at 0x19d7f80\u003e'\nTraceback (most recent call last):\n  File \"/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py\", line 532, in watcher\n    raise MyError(\"testing 123\")\ntest.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.\u003clocals\u003e.MyError: testing 123\nWarning -- Unraisable exception\nException ignored in: 'PyFunction_EVENT_DESTROY watcher callback for \u003cfunction TestPendingCalls.PendingTask.run_in_pending_call.\u003clocals\u003e.callback at 0x19fbce0\u003e'\nTraceback (most recent call last):\n  File \"/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py\", line 532, in watcher\n    raise MyError(\"testing 123\")\ntest.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.\u003clocals\u003e.MyError: testing 123\nWarning -- Unraisable exception\nException ignored in: 'PyFunction_EVENT_DESTROY watcher callback for \u003cfunction TestPendingCalls.PendingTask.run_in_pending_call.\u003clocals\u003e.callback at 0x1986a38\u003e'\nTraceback (most recent call last):\n  File \"/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py\", line 532, in watcher\n    raise MyError(\"testing 123\")\ntest.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.\u003clocals\u003e.MyError: testing 123\nWarning -- Unraisable exception\nException ignored in: 'PyFunction_EVENT_DESTROY watcher callback for \u003cfunction TestPendingCalls.PendingTask.run_in_pending_call.\u003clocals\u003e.callback at 0x19ed358\u003e'\nTraceback (most recent call last):\n  File \"/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py\", line 532, in watcher\n    raise MyError(\"testing 123\")\ntest.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.\u003clocals\u003e.MyError: testing 123\nWarning -- Unraisable exception\nException ignored in: 'PyFunction_EVENT_DESTROY watcher callback for \u003cfunction TestPendingCalls.PendingTask.run_in_pending_call.\u003clocals\u003e.callback at 0x1983750\u003e'\nTraceback (most recent call last):\n  File \"/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py\", line 532, in watcher\n    raise MyError(\"testing 123\")\ntest.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.\u003clocals\u003e.MyError: testing 123\nWarning -- Unraisable exception\nException ignored in: 'PyFunction_EVENT_DESTROY watcher callback for \u003cfunction TestPendingCalls.PendingTask.run_in_pending_call.\u003clocals\u003e.callback at 0x18d00a0\u003e'\nTraceback (most recent call last):\n  File \"/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py\", line 532, in watcher\n    raise MyError(\"testing 123\")\ntest.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.\u003clocals\u003e.MyError: testing 123\nWarning -- Unraisable exception\nException ignored in: 'PyFunction_EVENT_DESTROY watcher callback for \u003cfunction TestPendingCalls.PendingTask.run_in_pending_call.\u003clocals\u003e.callback at 0x197cfe0\u003e'\nTraceback (most recent call last):\n  File \"/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py\", line 532, in watcher\n    raise MyError(\"testing 123\")\ntest.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.\u003clocals\u003e.MyError: testing 123\nWarning -- Unraisable exception\nException ignored in: 'PyFunction_EVENT_DESTROY watcher callback for \u003cfunction TestPendingCalls.PendingTask.run_in_pending_call.\u003clocals\u003e.callback at 0x189bb00\u003e'\nTraceback (most recent call last):\n  File \"/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py\", line 532, in watcher\n    raise MyError(\"testing 123\")\ntest.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.\u003clocals\u003e.MyError: testing 123\nWarning -- Unraisable exception\nException ignored in: 'PyFunction_EVENT_DESTROY watcher callback for \u003cfunction TestPendingCalls.PendingTask.run_in_pending_call.\u003clocals\u003e.callback at 0x18529e8\u003e'\nTraceback (most recent call last):\n  File \"/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py\", line 532, in watcher\n    raise MyError(\"testing 123\")\ntest.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.\u003clocals\u003e.MyError: testing 123\nWarning -- Unraisable exception\nException ignored in: 'PyFunction_EVENT_DESTROY watcher callback for \u003cfunction WeakSet.__init__.\u003clocals\u003e._remove at 0x17015a0\u003e'\nTraceback (most recent call last):\n  File \"/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py\", line 532, in watcher\n    raise MyError(\"testing 123\")\ntest.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.\u003clocals\u003e.MyError: testing 123\nWarning -- Unraisable exception\nException ignored in: 'PyFunction_EVENT_DESTROY watcher callback for \u003cfunction many_vars at 0x189d770\u003e'\nTraceback (most recent call last):\n  File \"/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py\", line 532, in watcher\n    raise MyError(\"testing 123\")\ntest.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.\u003clocals\u003e.MyError: testing 123\nWarning -- Unraisable exception\nException ignored in: 'PyFunction_EVENT_DESTROY watcher callback for \u003cfunction  at 0x18d1bd8\u003e'\nTraceback (most recent call last):\n  File \"/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py\", line 532, in watcher\n    raise MyError(\"testing 123\")\ntest.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.\u003clocals\u003e.MyError: testing 123\nWarning -- Unraisable exception\nException ignored in: 'PyFunction_EVENT_DESTROY watcher callback for \u003cfunction  at 0x18159b8\u003e'\nTraceback (most recent call last):\n  File \"/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py\", line 532, in watcher\n    raise MyError(\"testing 123\")\ntest.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.\u003clocals\u003e.MyError: testing 123\nWarning -- Unraisable exception\nException ignored in: 'PyFunction_EVENT_DESTROY watcher callback for \u003cfunction  at 0x1696620\u003e'\nTraceback (most recent call last):\n  File \"/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py\", line 532, in watcher\n    raise MyError(\"testing 123\")\ntest.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.\u003clocals\u003e.MyError: testing 123\nWarning -- Unraisable exception\nException ignored in: 'PyFunction_EVENT_DESTROY watcher callback for \u003cfunction  at 0x1872448\u003e'\nTraceback (most recent call last):\n  File \"/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py\", line 532, in watcher\n    raise MyError(\"testing 123\")\ntest.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.\u003clocals\u003e.MyError: testing 123\nok\n```\n\n\u003c/details\u003e","author":{"url":"https://github.com/vstinner","@type":"Person","name":"vstinner"},"datePublished":"2023-08-23T17:50:39.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/108373/cpython/issues/108373"}